react-day-picker/src/contexts/DayPicker/formatters/formatYearCaption.test.ts

Customizable Date Picker for React

import { formatYearCaption } from './formatYearCaption';

const date = new Date(2022, 10, 21);

test('should return the formatted weekday name', () => {
  expect(formatYearCaption(date)).toEqual('2022');
});